One of the main reasons the dating methods can't be trusted is that creationists would bring modern things to scientists to get tested; such as old tires and rusty pipes and when scientists dated them, they got ages in the tens of thousands of years range.

There are a number of reasons why any dating method might be inaccurate and scientists know what these limitations are (one such limitation is known as he Reservoir effect). One tactic creationists use to throw off the date is to coat the object in a substance that will artificially trip up the dating method

...everything else you say is just so much non-sequitur tl;dr, Self-Mutilation. [/smartarse]

@David B.

"A tire is a composite object anyway"

The ones on my bike, made by Kenda of Taiwan, are (apart from the Kevlar beading, anti-puncture strip & reinforcing weave) mainly made of Nylon. A material that didn't exist until the 20th Century. Funny, that. And not in a 'funny-ha-ha' way, neither. [/smartarse II]

when did anyone ever bring those things to scientists? and why weren't they laughed out of the facility? carbon dating is only reliable for a range of years. a RANGE. if the date comes out too high, they switch to a different, more conclusive method.

And, assuming you're talking about Carbon-14 dating here because most fundie Christians try to deny it actually works, you can only get Carbon-14 from old organic material, not things like tires and metal pipes.

There's a wonderful video by a chap called Potholer on Youtube about this. Guy brings completely mineralised fossil to lab for C14 dating. "We can't date that, there's no fucking carbon in it!" is the refrain. After much arguing they did it anyway just to shut him up and tested the shellac on the outside surface, the only hint of carbon to be had.

Cue imbecile crowing in triumph about how carbon dating doesn't work and gives the wrong dates for stuff.

"First the Earth cooled. And then the dinosaurs came, but they got too big and fat, so they all died and they turned into oil. And then the Arabs came and they bought Mercedes Benzes. And Prince Charles started wearing all of Lady Di's clothes. I couldn't believe it!" - Jacobs, Airplane II

So if you date a Mercedes Benz, you might get arrested for mopery. Stick to licking wall paper.

Besides which the age of the material used in manufactured goods will vary drastically from the date of manufacture. A table might be two years old, but the tree it was carved out of can be several thousand.